#ifndef _LINUX_MSDOS_FS_H
#define _LINUX_MSDOS_FS_H

/*
* The MS-DOS filesystem constants/structures
*/
//#include <asm/byteorder.h>

#define SECTOR_SIZE     512             /* sector size (bytes) */
#define SECTOR_BITS     9               /* log2(SECTOR_SIZE) */
#define MSDOS_DPB       (MSDOS_DPS)     /* dir entries per block */
#define MSDOS_DPB_BITS  4               /* log2(MSDOS_DPB) */
#define MSDOS_DPS       (SECTOR_SIZE / sizeof(struct msdos_dir_entry))
#define MSDOS_DPS_BITS  4               /* log2(MSDOS_DPS) */
#define CF_LE_W(v)      le16_to_cpu(v)
#define CF_LE_L(v)      le32_to_cpu(v)
#define CT_LE_W(v)      cpu_to_le16(v)
#define CT_LE_L(v)      cpu_to_le32(v)


#define MSDOS_SUPER_MAGIC 0x4d44 /* MD */

#define MSDOS_ROOT_INO  1       /* == MINIX_ROOT_INO */
#define MSDOS_DIR_BITS  5       /* log2(sizeof(struct msdos_dir_entry)) */

/* directory limit */
#define FAT_MAX_DIR_ENTRIES     (65536)
#define FAT_MAX_DIR_SIZE        (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS)

#define ATTR_NONE       0       /* no attribute bits */
#define ATTR_RO         1       /* read-only */
#define ATTR_HIDDEN     2       /* hidden */
#define ATTR_SYS        4       /* system */
#define ATTR_VOLUME     8       /* volume label */
#define ATTR_DIR        16      /* directory */
#define ATTR_ARCH       32      /* archived */

/* attribute bits that are copied "as is" */
#define ATTR_UNUSED     (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
/* bits that are used by the Windows 95/Windows NT extended FAT */
#define ATTR_EXT        (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)

#define CASE_LOWER_BASE 8       /* base is lower case */
#define CASE_LOWER_EXT  16      /* extension is lower case */

#define DELETED_FLAG    0xe5    /* marks file as deleted when in name[0] */
#define IS_FREE(n)      (!*(n) || *(n) == DELETED_FLAG)

/* valid file mode bits */
#define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO)
/* Convert attribute bits and a mask to the UNIX mode. */
#define MSDOS_MKMODE(a, m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO))

#define MSDOS_NAME      11      /* maximum name length */
#define MSDOS_LONGNAME  256     /* maximum name length */
#define MSDOS_SLOTS     21      /* max # of slots for short and long names */
#define MSDOS_DOT       ".          "   /* ".", padded to MSDOS_NAME chars */
#define MSDOS_DOTDOT    "..         "   /* "..", padded to MSDOS_NAME chars */

/* media of boot sector */
#define FAT_VALID_MEDIA(x)      ((0xF8 <= (x) && (x) <= 0xFF) || (x) == 0xF0)
#define FAT_FIRST_ENT(s, x)     ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \
	MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x))

/* start of data cluster's entry (number of reserved clusters) */
#define FAT_START_ENT   2

/* maximum number of clusters */
#define MAX_FAT12       0xFF4
#define MAX_FAT16       0xFFF4
#define MAX_FAT32       0x0FFFFFF6
#define MAX_FAT(s)      (MSDOS_SB(s)->fat_bits == 32 ? MAX_FAT32 : \
	MSDOS_SB(s)->fat_bits == 16 ? MAX_FAT16 : MAX_FAT12)

/* bad cluster mark */
#define BAD_FAT12       0xFF7
#define BAD_FAT16       0xFFF7
#define BAD_FAT32       0x0FFFFFF7

/* standard EOF */
#define EOF_FAT12       0xFFF
#define EOF_FAT16       0xFFFF
#define EOF_FAT32       0x0FFFFFFF

#define FAT_ENT_FREE    (0)
#define FAT_ENT_BAD     (BAD_FAT32)
#define FAT_ENT_EOF     (EOF_FAT32)

#define FAT_FSINFO_SIG1 0x41615252
#define FAT_FSINFO_SIG2 0x61417272
#define IS_FSINFO(x)    (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \
	&& le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2)

/*
* ioctl commands
*/
#define VFAT_IOCTL_READDIR_BOTH         _IOR('r', 1, struct dirent [2])
#define VFAT_IOCTL_READDIR_SHORT        _IOR('r', 2, struct dirent [2])
/* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */
#define FAT_IOCTL_GET_ATTRIBUTES        _IOR('r', 0x10, __u32)
#define FAT_IOCTL_SET_ATTRIBUTES        _IOW('r', 0x11, __u32)

/*
* vfat shortname flags
*/
#define VFAT_SFN_DISPLAY_LOWER  0x0001 /* convert to lowercase for display */
#define VFAT_SFN_DISPLAY_WIN95  0x0002 /* emulate win95 rule for display */
#define VFAT_SFN_DISPLAY_WINNT  0x0004 /* emulate winnt rule for display */
#define VFAT_SFN_CREATE_WIN95   0x0100 /* emulate win95 rule for create */
#define VFAT_SFN_CREATE_WINNT   0x0200 /* emulate winnt rule for create */

struct fat_boot_sector {
	__u8    ignored[3];     /* Boot strap short or near jump */
	__u8    system_id[8];   /* Name - can be used to special case
							partition manager volumes */
	__u8    sector_size[2]; /* bytes per logical sector */
	__u8    sec_per_clus;   /* sectors/cluster */
	__le16  reserved;       /* reserved sectors */
	__u8    fats;           /* number of FATs */
	__u8    dir_entries[2]; /* root directory entries */
	__u8    sectors[2];     /* number of sectors */
	__u8    media;          /* media code */
	__le16  fat_length;     /* sectors/FAT */
	__le16  secs_track;     /* sectors per track */
	__le16  heads;          /* number of heads */
	__le32  hidden;         /* hidden sectors (unused) */
	__le32  total_sect;     /* number of sectors (if sectors == 0) */

	/* The following fields are only used by FAT32 */
	__le32  fat32_length;   /* sectors/FAT */
	__le16  flags;          /* bit 8: fat mirroring, low 4: active fat */
	__u8    version[2];     /* major, minor filesystem version */
	__le32  root_cluster;   /* first cluster in root directory */
	__le16  info_sector;    /* filesystem info sector */
	__le16  backup_boot;    /* backup boot sector */
	__le16  reserved2[6];   /* Unused */
};

struct fat_boot_fsinfo {
	__le32   signature1;    /* 0x41615252L */
	__le32   reserved1[120];        /* Nothing as far as I can tell */
	__le32   signature2;    /* 0x61417272L */
	__le32   free_clusters; /* Free cluster count.  -1 if unknown */
	__le32   next_cluster;  /* Most recently allocated cluster */
	__le32   reserved2[4];
};

struct msdos_dir_entry {
	__u8    name[8],ext[3]; /* name and extension */
	__u8    attr;           /* attribute bits */
	__u8    lcase;          /* Case for base and extension */
	__u8    ctime_cs;       /* Creation time, centiseconds (0-199) */
	__le16  ctime;          /* Creation time */
	__le16  cdate;          /* Creation date */
	__le16  adate;          /* Last access date */
	__le16  starthi;        /* High 16 bits of cluster in FAT32 */
	__le16  time,date,start;/* time, date and first cluster */
	__le32  size;           /* file size (in bytes) */
};

/* Up to 13 characters of the name */
struct msdos_dir_slot {
	__u8    id;             /* sequence number for slot */
	__u8    name0_4[10];    /* first 5 characters in name */
	__u8    attr;           /* attribute byte */
	__u8    reserved;       /* always 0 */
	__u8    alias_checksum; /* checksum for 8.3 alias */
	__u8    name5_10[12];   /* 6 more characters in name */
	__le16   start;         /* starting cluster number, 0 in long slots */
	__u8    name11_12[4];   /* last 2 characters in name */
};

struct fat_slot_info {
	loff_t i_pos;           /* on-disk position of directory entry */
	loff_t slot_off;        /* offset for slot or de start */
	int nr_slots;           /* number of slots + 1(de) in filename */
	struct msdos_dir_entry *de;
	struct buffer_head *bh;
};

#endif
